He's also been suggested before for the role in one of this threads previous iterations, and I'll repeat my argument from then: Matt Damon, or an actor similar to him (an actor ususally cast in heroic or anti-heroic roles who's just a generation or so older than Cavill) would be perfect for the role because he'd bring good-guy charisma to a nefarious bad-guy. We need someone who can almost convince us he is taking a principled stand against "the alien" while still having the range to go really dark.

I agree completely. Lex must be likeable and charismatic because we need to believe that the public is totally sold on him as a visionary and a good guy.